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v3.10.0.1

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement [Abstract] |  |  |  |
Revenues | $ 2,656,348 | $ 2,200,374 | $ 5,073,924 | $ 4,378,544
Cost of services (including depreciation) | 2,322,977 | 1,898,209 | 4,439,505 | 3,810,191
Gross profit | 333,371 | 302,165 | 634,419 | 568,353
Selling, general and administrative expenses | 206,104 | 185,880 | 421,526 | 370,432
Amortization of intangible assets | 10,507 | 6,494 | 20,912 | 13,056
Change in fair value of contingent consideration liabilities | (6,279) | 0 | (6,279) | 0
Operating income | 123,039 | 109,791 | 198,260 | 184,865
Interest expense | (9,178) | (4,271) | (15,956) | (8,236)
Interest income | 660 | 164 | 806 | 451
Other income (expense), net | (10,426) | (1,079) | (22,401) | (1,443)
Income before income taxes | 104,095 | 104,605 | 160,709 | 175,637
Provision for income taxes | 29,389 | 40,245 | 47,392 | 62,837
Net income | 74,706 | 64,360 | 113,317 | 112,800
Less: Net income attributable to non-controlling interests | 341 | 523 | 1,338 | 696
Net income attributable to common stock | $ 74,365 | $ 63,837 | $ 111,979 | $ 112,104
Earnings per share attributable to common stock, basic (in usd per share) | $ 0.49 | $ 0.41 | $ 0.72 | $ 0.72
Earnings per share attributable to common stock, diluted (in usd per share) | $ 0.48 | $ 0.41 | $ 0.72 | $ 0.72
Weighted average basic shares outstanding (in shares) | 153,325 | 155,090 | 154,906 | 154,859
Weighted average diluted shares outstanding (in shares) | 154,595 | 156,165 | 156,112 | 155,745

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